Commit 6a907738 authored Apr 15, 2015 by Chris Wilson Committed by Ingo Molnar Apr 16, 2015

x86/asm: Enable fast 32-bit put_user_64() for copy_to_user()



For fixed sized copies, copy_to_user() will utilize
__put_user_size() fastpaths. However, it is missing the
translation for 64-bit copies on x86/32.

Testing on a Pinetrail Atom, the 64 bit put_user() fastpath
is substantially faster than the generic copy_to_user()
fallback.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: intel-gfx@lists.freedesktop.org
Link: http://lkml.kernel.org/r/1429091486-11443-1-git-send-email-chris@chris-wilson.co.uk


Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent c0f6feba

arch/x86/include/asm/uaccess_32.h

+4 −0

Original line number	Diff line number	Diff line
		@@ -59,6 +59,10 @@ __copy_to_user_inatomic(void __user to, const void from, unsigned long n)
		__put_user_size((u32 )from, (u32 __user *)to,
		4, ret, 4);
		return ret;
		case 8:
		__put_user_size((u64 )from, (u64 __user *)to,
		8, ret, 8);
		return ret;
		}
		}
		return __copy_to_user_ll(to, from, n);